That sucks man, if only I lived in that part of the country, I'd probably drive you two down, especially as you've obv put a lot of effort into the show, and also because I've never been to a show before... :-(
At this point, if I were you, I'd be phoning up mates and asking them for a BIG favour. I once paid a friend to drive me to W London to pick up an Amiga when my car was off the road...any chance? Or how about someone's parents, brother, sister, etc?